Question

我有以下应用程序代码：

Public Class Form1

    Public Sub New()
        InitializeComponent()
        Dim datatableCombo = New DataTable
        datatableCombo.Columns.Add("ID", GetType(Integer))
        datatableCombo.Columns.Add("Name", GetType(String))
        datatableCombo.Rows.Add({0, ""})
        datatableCombo.Rows.Add({1, "123"})
        datatableCombo.Rows.Add({2, "234"})
        datatableCombo.Rows.Add({3, "456"})

        UltraCombo1.DataSource = datatableCombo

        Dim datatableGrid = New DataTable
        datatableGrid.Columns.Add("ID", GetType(Integer))
        datatableGrid.Columns.Add("Name", GetType(String))
        SsiGrid1.DataSource = datatableGrid

        SsiGrid1.DisplayLayout.GroupByBox.Hidden = True
        SsiGrid1.DisplayLayout.Override.RowSelectors = DefaultableBoolean.True
        SsiGrid1.DisplayLayout.Override.AllowAddNew = AllowAddNew.TemplateOnBottom

        SsiGrid1.DisplayLayout.Bands(0).Columns("ID").EditorComponent = UltraCombo1
        SsiGrid1.DisplayLayout.Bands(0).Columns("ID").CellClickAction = CellClickAction.EditAndSelectText
        SsiGrid1.DisplayLayout.Bands(0).Columns("ID").Style = ColumnStyle.DropDownValidate
    End Sub

    Private Sub UltraCombo1_InitializeLayout(ByVal sender As Object, ByVal e As Infragistics.Win.UltraWinGrid.InitializeLayoutEventArgs) Handles UltraCombo1.InitializeLayout
        UltraCombo1.ValueMember = "ID"
        UltraCombo1.DisplayMember = "Name"

        Dim band As UltraGridBand = Me.UltraCombo1.DisplayLayout.Bands(0)

        Dim position As Integer = 0
        band.Columns("ID").Hidden = False
        band.Columns("ID").Header.VisiblePosition = position
        position += 1
        band.Columns("Name").Hidden = False
        band.Columns("Name").Header.VisiblePosition = position
        position += 1

        band.Override.AllowRowFiltering = DefaultableBoolean.False
        band.Override.RowFilterMode = RowFilterMode.AllRowsInBand

        band.ColumnFilters("ID").FilterConditions.Clear()
        band.ColumnFilters("ID").FilterConditions.Add(FilterComparisionOperator.NotEquals, 0)
    End Sub

End Class

我认为这应该使得组合框不会显示零行，除非您实际键入零。但是当我运行它时，它确实显示零行。我的代码有问题吗？

Answer 1

你是对的。此代码应隐藏下拉列表中的零。出现此错误的一个可能原因可能是您实际上没有处理组合的InitializeLayout事件。您可以通过打开设计器轻松检查这一点，如果针对InitializeLayout事件选择了UltraCombo1_InitializeLayout，则选择组合并检入属性窗口。您还可以在事件处理程序中的某处放置断点，看看是否到达它。

UltraCombo过滤器不起作用

1 个答案: